the anisotropy of thermal conductivity in diborides of zirconium and hafnium
- Paper number
IAC-13,C2,P,33.p1,x17941
- Author
Dr. Luo Xiaoguang, China Academy of Aerospace Aerodynamics(CAAA), China
- Coauthor
Dr. Ai Bangcheng, China Aerospace Science and Industry Corporation, China
- Coauthor
Mr. Miao Wenbo, Chinese Society of Astronautics, China
- Year
2013
- Abstract
Diborides of zirconium and hafnium based ultra high temperature ceramics have been widely used as non-ablative thermal protection materials. The elastic anisotropy plays an important role in their thermal conductivity behavior. In this paper, the anisotropic elastic and thermal properties of layered ZrB2 and HfB\small 2 with the AlB\small 2 structure have been investigated by from first principles using density functional theory in a wide temperature ranges. The factors determining the significance in anisotropy in AlB\small 2-type diborides are discussed from crystal structure and atomic bonding characters. For instance, the calculated in-plane thermal conductivity is always larger than that along the c-axis, parallel to the layer stacking direction.
- Abstract document
- Manuscript document
IAC-13,C2,P,33.p1,x17941.pdf (🔒 authorized access only).
To get the manuscript, please contact IAF Secretariat.